Heating device.



A. R. SPRAGUE.

HEATING DEVICE.

APPLlcAKTloN FILED APR. l2. 1913.

Patented Nov. 2,

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TE@ STATES FFQE,

ALMERIN It. SPR/icon, or SAN BENITO, Texas, AssIeNoi'a To Louis A. not?, or'

, cnicas-o, ILLINOIS.

HEATING -DnvI'cn Specification of Letters Patent.

Application filed April 12, 1913. Serial No. 760,812.

To all whom it may concern Be it known that l, ALMERIN SrnAGUE,

a citizen of the United States, residing in San Benito, county of Iaameron, and State of rferas, have invented new and useful linproveinents in Heating Devices, of which the following is a specification.

This invention relates to heating devices and more especially to a devicelfor protecting trees, plants and crops against eXtreme cold and frost. Y

in the early spring and later'fall of the year it is occasionally necessary to warm the trees in an orchard to prevent freezing and damage to the fruit and this is usually done by placing in the orchard a large number of heaters designed ordinarily to burn crude oil. As the devices must be employed in largeV number and may be used only occasionallv it is desirable that their construction should be quite cheap, and they should also be made in such forni as to permit of compact storage in a small space. Among the other practical requirements of an or- V chard heater is some provision for adjusting the draft to adapt the device f'or different kinds of fuel oil, in order that it may burn with the maximum e'iiciency; and to adapt it for solid fuel if desired. It should also radiate its heat through a considerable space in order to prevent loss by the direct upward rise of air and products of combustion heated to a high temperature.

A device intended to supply the foregoing requirements and embodying the principles of the present invention is illustrated in the accompanying drawings in which;

Figure l is a view of the device in vertical aXial section. Fig. 2 is a vertical section on the line 2 of Fig. 1. 3 is a top view partly in plan and partly in horizontal section.

As shown in said drawings the device coinprises a fuel receptacle l, a removable, rectangular top or cover therefor 2, and a chimney 3. The fuel receptacle is made very simply in the form of a bucket or pail of sheet iron or sheet metal, with a rolled rim 5 for additional strength and stiffness. Its size should depend upon the practical requirements as to fuel capacity, for when a fire is started in the device it should burn as long as may be ordinarily required to protect the orchard, which is usually during the night, and if the fuel supply is then exhausted it will not be necessary to extinguish the device. rlChe fuel receptacle is made slightly larger in diameter at the top than at the bottom so that with the tops or covers 2 removed a number of the n may be nested together for convenience in storing. The removable top or cover 2 is made of a single piece of sheet metal which is bent to formupper and lower parallel surfaces, 8 and 9 respectively, separated sufliciently to form an air space between them, rllhese surfaces are joined along one side by an integral, vertical wall l1; and along the two adjacent sides the upper one is bent down and the lower one bent up to over-lap and form vertical side walls of double thickness, indicated at 1A, 14 in Fig. 2. rlhe downturned part of the upper surface 8, which telescopes over the lip-turned part of the lower surface 9, is also made of sufficient width to extend below such lower surface in the form of two strips 1S, 18 which are bent diagonally inward to hold the telescoping parts4 together and to engage under' thev rolled rim 5 of the fuel pot, when the cover is slid into place, and they prevent its acci dental displacement. At the fourth side of the Vdouble surfaced cover an unobstructed opening is left into the space between the two surfaces and through the lower surface 9 are cut two large curved slots 20, 20 providing an air inlet into the fuel receptacle from such space. Through the upper and lower surfaces 8 and 9 are also cut large circular openings for the reception of a piece of a small stove pipe 3 forming a chimney for the device; and the two circular openings are placed slightly out of vertical alinement so that the pipe will be wedged aga-inst the sides of the openings and thereby prevented by its frictional engagement from sliding downward. A circular cover 24 is also provided for the chimney, such cover having at one side an integral extension which is bent into the form of `a hook 25 to engage in a small slot 26 near the top of the chimney and form a hinge; whereby the chimney cover may be opened or closed, as

indicated by its positions in full and dotted l lines in Fig. l.

In the operation of the device a quantity of fuel, preferably liquid, corresponding to the number of hours of heating required is placed in the fuel receptacle and ignited, and the double cover 2 is then slid into place Patented Nov. 2, 1915/ and the chimney 3 inserted. The height of this chimney should be adjusted according to the fuel level, when liquid fuel is ein` ployed, and also according to the draft requirements, it being noted that sometimesit is desirable to have the device smoke, as for example when the smoke will not 1n]ure the v'trees orfruit, and a smoke cloud may be i air is first heated. The double cover 2, of

greater area than the top of the fuel pot, and the chimney 3 also present a large surface for radiating the heat developed; thus producing -a large volume of airheated to a Vmoderate temperature rather than a small volume of air heated to a high temperature Vwhich would rapidly escape by direct convection upward. This principle is illustrated in gas heaters used ,1n houses where yit has been observed that a single gasjet will not materially warm the air in a room, but-1f a suitable radiating device, such as a pieceof sheet iron, 1s placed over the )et and heated thereby it will radiate the heat in all directions and thus warm the room.

If the Wind is blowing and a strong draft is desired, the device may be turned With the open side of the double cover turned toward the wind.; otherwise it maybe turned at other angles.

I claim as my invention: i Y l. In a. heating device, a fuel receptacle, a cover therefor comprising an upper and a lower surface with an air space between, an opening-from such air space into the fuel receptacle, corresponding openings through the two surfaces, and a chimney fitting 4:5V

closelv into such two last mentioned openings.l Y

2. In a heating device, a fuel receptacle, a cover therefor, an air passage through such cover, an opening from such air passage into the fuel receptacle, an opening through such cover, anda chimney extending ithrough such opening and adjustable in height. l

3. In a heating device, afuel receptacle Y,

having a projecting rim, a covercomprising 55 P. BEDFORD, .Y O. B. FnANKs.

Copies 0f this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

` Washington, D. C. 

